Skipping Dark Crypt then, but for madness,
Madness is actually good experience at first, since you rarely get bored. Normal and most rare mobs are easy fights, but in madness you have to be careful and focus all the time, thing is challenging as hell. I'd argue don't scale the zone 150% more, it is already "impossible" when:
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All creature talent levels increased by 170%
Rare creatures are far more frequent and random bosses start to appear.
Bosses will have randomly selected talents
Player is being hunted!
Randomly all foes in a radius will get a feeling of where she/he is.
Sure you can try and enter every zone possible, just to "lock" the levels, but why force player to do those unnatural moves?